Countably regular good spaces and almost Cκ-spaces

Arash Hayati

https://orcid.org/0009-0007-8621-3734

Iran, Islamic Republic of

Shahid Chamran University of Ahvaz image/svg+xml

Department of Mathematics, Faculty of Mathematical Sciences and Computer

Mehrdad Namdari

https://orcid.org/0000-0003-0966-7234

Iran, Islamic Republic of

Shahid Chamran University of Ahvaz image/svg+xml

Department of Mathematics, Faculty of Mathematical Sciences and Computer

Somayeh Soltanpour

https://orcid.org/0000-0002-1072-9845

Iran, Islamic Republic of

Petroleum University of Technology image/svg+xml

Department of Basic Science, Petroleum University of Technology, Ahvaz, Iran.

|

Accepted: 2024-11-14

|

Published: 2025-04-01

DOI: https://doi.org/10.4995/agt.2025.22006
Funding Data

Downloads

Keywords:

Functionally countable subalgebra, space of countable pseudocharacter, almost-resolvable space, CUC-space, CRG-space, almost Cκ-Baire space, almost CP-point, almost CP-space

Supporting agencies:

Shahid Chamran University of Ahvaz

Abstract:

In this paper, we build upon our previous studies by redefining fundamental concepts and transferring them from rings of continuous functions to rings of continuous functions with countable images. This article will focus on regular good spaces (``"RG-spaces", for short) and related concepts. Specifically, we introduce and examine two generalizations of RG-spaces, calling countably regular good spaces and strongly countably regular good spaces. 

Show more Show less

References:

F. Azarpanah, O. A. S. Karamzadeh, Z. Keshtkar, and A. R. Olfati, On maximal ideals of C_c(X) and the uniformity of its localization, Rocky Mt. J. Math. 48 (2018), 345-384. https://doi.org/10.1216/RMJ-2018-48-2-345

F. Azarpanah, E. Ghashghaei, and M. Ghoulipour, C(X): Something old and something new. Commun. Algebra 49 (2020), 185-206. https://doi.org/10.1080/00927872.2020.1797070

R. Bolstein, Sets of points of discontinuity, Proc. Amer. Math. Soc. 38 (1973), 193-197. https://doi.org/10.1090/S0002-9939-1973-0312457-9

G. H. Butcher, An extension of the sum theorem of dimension theory, Duke Math. 18 (1951), 859-874. https://doi.org/10.1215/S0012-7094-51-01881-9

M. Ghadermazi, O. A. S. Karamzadeh, and M. Namdari, C(X) versus its functionally countable subalgebra, Bull. Iran. Math. Soc. 245 (2019), 173-187. https://doi.org/10.1007/s41980-018-0124-8

M. Ghadermazi, O. A. S. Karamzadeh, and M. Namdari, On the functionally countable subalgebra of C(X), Rend. Sem. Mat. Univ. Padova, 129 (2013), 47-69. https://doi.org/10.4171/rsmup/129-4

L. Gillman and M. Jerison, Rings of Continuous Functions, The University Series in Higher Math., Van Nostrand, Princeton, N. J., 1960. https://doi.org/10.1007/978-1-4615-7819-2

A. Hayati, M. Namdari, and M. Paimann, On countably uniform closed-spaces, Quaest. Math. 42 (2019), 593-604. https://doi.org/10.2989/16073606.2018.1476415

M. Henriksen, R. Raphael and R.G. Woods, A minimal regular ring extension of C(X), Fund. Math. 172 (2002), 1-17. https://doi.org/10.4064/fm172-1-1

O. A. S. Karamzadeh and Z. Keshtkar, On c-realcompact spaces, Quaestiones Mathematicae 41 (2018), 1135-1167. https://doi.org/10.2989/16073606.2018.1441919

O. A. S. Karamzadeh, M. Namdari, and S. Soltanpour, On the locally functionally countable subalgebra of C(X), Appl. Gen. Topol. 16, no. 2 (2015), 183-207. https://doi.org/10.4995/agt.2015.3445

J. F. Kennison, Structure and co-structure for strongly regular rings, J. Pure. Appl. Algebra 5 (1974), 321-332. https://doi.org/10.1016/0022-4049(74)90041-3

R. Levy, Almost P-spaces, Can. J. Math. 29 (1977), 284-288. https://doi.org/10.4153/CJM-1977-030-7

R. Levy and M.D. Rice, Normal P-spaces and the G_delta-topology, Colloq. Math. 44 (1981), 227-240. https://doi.org/10.4064/cm-44-2-227-240

S. Mehran, M. Namdari, and S. Soltanpour, On the essentiality and primeness of λ-super socle of C(X), Appl. Gen. Topol. 19, no. 2 (2018), 261-268. https://doi.org/10.4995/agt.2018.9058

M. Namdari, The story of rings of continuous functions in Ahvaz: From C(X) to C_c(X), Journal of the Iranian Mathematical Society 4, no. 2 (2023), 149-177.

R. Raphael and R. G. Woods, On RG-spaces and the regularity degree, Appl. Gen. Topol. 7 (2006), 72-101. https://doi.org/10.4995/agt.2006.1934

S. Soltanpour, On the locally socle of C(X) whose local cozeroset is cocountable (cofinite), Hacettepe Journal of Mathematics and Statistics 48, no. 5 (2019), 1430-1436. https://doi.org/10.15672/HJMS.2018.583

F. D. Tall, The countable chain condition versus separability-applications of Martin's axiom, General Topology Appl. 4 (1974), 315-339. https://doi.org/10.1016/0016-660X(74)90010-5

Show more Show less